<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    

    <style>
        /* #div1{background-color: red;} */

        /* .box{
            background-color: red;
        } */
        
        /* .box{background-color: green; width: 300px;}
        .fox{font-size: 20px;} */

        /* #list li {border-width: 5px; border-color: green; border-style: solid;} */
        /* div[class$=search] {
            background-color: red;
        } */
        
        /* div{
            width: 300px;
            height: 300px;
            background-color: red;
        }

        div:hover{
            background-color: green;
        }

        div:active {
            background-color: yellow;
        } */

        /* a:link{color: blue;}
        a:visited{color: green;}
        a:hover{color: red;}
        a:active{color: yellow;} */
        /* div::before{
            color: red;
            content: "world";
        } */

        :checked {
            width: 100px;
            height: 100px;
        }
        :focus {
            background-color: red;
        }

        :disabled{
            width: 200px;
            height: 100px;
        }

    </style>

</head>
<body>
    <!-- <div id="div1">这是一个块</div> -->
    <!-- <div class="box">这十一</div>
    <div class="box">萨法</div> -->
    <!-- <div class="box fox">这是一个s快打算</div> -->

    <!-- <ul id="list">
        <li></li>

            <ul>
                <li></li>
                <li></li>
                <li></li> 
                <li></li>

            </ul>

        <li></li>
        <li></li>
    </ul> -->

    <!-- <div class="search">aaaaaaa</div>
    <div class="search-but">bbbbbbb</div>
    <div class="but-search">ccccccc</div> -->
    <!-- <div></div> -->
    <!-- <a href="http:www.baidu.com">这是一个连接</a> -->
    <!-- <div>hello </div> -->

    <input type="checkbox">
    <input type="checkbox">
    <input type="checkbox">

    <input type="text">

</body>
</html>